Hoping to take the sting out of current methods of glucose testing, Apple CEO Tim Cook has been wearing a glucose tracker prototype paired with an Apple Watch.

Adding weight to previous reports that Apple is employing a team of biomechanical engineers to develop a noninvasive device to track diabetics’ blood sugar levels, Cook told students at the University of Glasgow in February that the device has helped him to better understand the impact of certain foods on blood sugar levels.

“It’s mentally anguishing to stick yourself many times a day to check your blood sugar,” Cook said, according to CNBC. “There is lots of hope out there that if someone has constant knowledge of what they’re eating, they can instantly know what causes the response…and that they can adjust well before they become diabetic.”

The company’s glucose tracker has been in development for at least five years, CNBC reported last month.